Physics with Polarized Beams at an Electron Ion Collider EIC International Users Meeting Stony Brook University Stony Brook, New York June 24-27, 2014.

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Presentation on theme: "Physics with Polarized Beams at an Electron Ion Collider EIC International Users Meeting Stony Brook University Stony Brook, New York June 24-27, 2014."— Presentation transcript:

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Physics with Polarized Beams at an Electron Ion Collider EIC International Users Meeting Stony Brook University Stony Brook, New York June 24-27, /24/141EIC International Users Meeting, Stony Brook Univ., NY Zein-Eddine Meziani Temple University “It is difficult and often impossible to judge the value of a problem correctly in advance; for the final award depends upon the gain which science obtains from the problem.” David Hilbert, 1900 Paris Thanks to everyone who contributed to the EIC White Paper effort and particularly to my co-Editors Abhay Deshpande and Jianwei Qiu

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Nuclear Science and QCD Nuclear Science To discover, explore and understand all forms of nuclear matter Nuclear Matter Quarks + Gluons + Interactions  Nucleons  Nuclei At the heart of the visible universe, accounting for essentially all its mass Experimental Tools: Giant electron microscopes opened the gateway to nucleon structure at Stanford and at SLAC using electron proton scattering. Modern microscopes are pushing the frontiers of resolution, brightness and polarization combined. Theory Tools: Quantum Chromodynamics (QCD) A fundamental theory of quarks and gluons Describes the formation of all forms of nuclear matter 2 Understanding of QCD is a fundamental and compelling goal of Nuclear Science

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The Science Problem ? The structure of all nuclear matter in Quantum Chromodynamics (QCD) and confinement What do we know? QCD successes in the perturbative regime are impressive Many experimental tests led to this conclusion But Confinement in QCD is still a puzzle and has been identified as one of the top millenium problems in Physics! (Gross, Witten,.…) Many conferences have been devoted to this problem Present theoretical tools: Q2Q2 Lattice QCD pQCD 0110 ∞ Models, AdS/CFT… 06/24/14 3

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Fundamental QCD Question How do quarks and gluons confine themselves into a proton? The color confinement  Proton spin: If we do not understand proton spin from QCD, we do not understand QCD! It is more than the number ½! It is the interplay between the intrinsic properties and interactions of quarks and gluons Need a polarized proton beam! 10 “Hints” from knowing hadron structure  Hadron structure: 06/24/14

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Electron-Ion Collider  An ultimate machine to provide answers to QCD questions 12  A collider to provide kinematic reach well into the gluon-dominated regime  An electron beam to bring to bear the unmatched precision of the electromagnetic interaction as a probe  Polarized nucleon beams to determine the distributions and correlations of sea quark and gluon distributions with the nucleon spin  A machine at the frontier of polarized luminosity, combined with versatile kinematics and beam species Answers all above QCD questions at a single facility 06/24/14

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 Coverage and Simulation: No other machine in the world can do this! fb -1 What can EIC do for the Sivers function? x=0.1  Unpolarized quark inside a transversely polarized proton: JLab12 For Large-x

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Summary  EIC is “the” machine to understand the glue that bind us all  It is “the” brightest sub-femtometer scope to ANSWER fundamental questions in QCD in ways that no other facilities in the world can  Extends the QCD programs developed at BNL and JLab in dramatic and fundamentally important ways  EIC would benefit fundamental nuclear science and accelerator / detector technology 30 “It is by the solution of problems that the investigator tests the temper of his steel; he finds new methods and new outlooks, and gains a wider and freer horizon.” D. Hilbert Paris, 1900